Primality proof for n = 13909529:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=1738691.html>1738691 is prime.</a>
<br>b^((n-1)/1738691)-1 mod n = 255, which is a unit, inverse 12327661.
<p>(1738691) divides n-1.
<p>(1738691)^2 > n.
<p>n is prime by Pocklington's theorem.